Oppy has already arrived at the etched terrain but not exactly at the "Erebus Highway".
It is currently located (as of sol 562) here: Click to view attachment
This image (a previous version was posted here) is a combination of Dilo's vertical projections and MOC imagery in which I tried to identify some of the outcrops and also remark the Erebus Highway.
Now, Oppy as just turned left (east) to catch the highway instead of going straight ahead to Erebus (which would mean crossing about 100m of dunes, leaving the outcrops behind).
But can we see the Erebus Highway on the MER images?
I think so.
Click to view attachment
The lower section of the image above is a navcam panorama taken on sol 562, in which I pinpointed some of the same outcrops seen on the first picture. The upper section is part of a pancam pano taken on the same sol, in which I remarked what I believe is a section of the Erebus highway.
The features seen there are at about 50m range, which is consistent with the distance to the highway based on MOC images.